package com.hmdp.service.impl;

import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.Voucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.SeckillVoucherMapper;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.service.IVoucherService;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.UserHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {



    @Autowired
    private ISeckillVoucherService seckillVoucherService;

    @Autowired
    private RedisIdWorker redisIdWorker;

    @Override
    public Result seckillVoucher(Long voucherId) {
        // 1.查询优惠券
        SeckillVoucher voucher = seckillVoucherService.getById(voucherId);
        // 2.判断秒杀是否开始
        if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {
            return Result.fail("秒杀尚未开始");
        }
        // 3.判断秒杀是否结束
        if (voucher.getEndTime().isBefore(LocalDateTime.now())) {
            return Result.fail("秒杀已结束");
        }
        // 4.判断库存是否充足
        if (voucher.getStock()<0) {
            return Result.fail("库存不足");
        }
//        Long userId = UserHolder.getUser().getId();
        // 5.扣减库存
        boolean success = seckillVoucherService.update().setSql("stock=stock-1")
                .eq("voucher_id", voucherId).update();
        if (!success) {
            return Result.fail("库存不足");
        }

        // 6.创建订单 订单号voucherId为唯一订单
        VoucherOrder voucherOrder = new VoucherOrder();
        // 用户id
        voucherOrder.setUserId(1010L);
        long oredeId = redisIdWorker.nextId("order");
        // 订单号
        voucherOrder.setId(oredeId);
        // 优惠券id
        voucherOrder.setVoucherId(voucherId);
        save(voucherOrder);

        return Result.ok(oredeId);
    }
}
